/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: Lenovo
 * Date: 2025-05-11
 * Time: 13:48
 */
//计算1/1-1/2+1/3-1/4+1/5 …… + 1/99 - 1/100 的值
public class test {
    public static void main(String[] args) {
        double sum=0;
        for (int i = 1; i <= 100; i++) {
            if(i%2==1)
                sum+=1.0/i;
            else
                sum-=1.0/i;
        }
        System.out.printf("%.5f",sum);
    }
}
